diff options
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/video/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/broadsheetfb.c | 568 |
3 files changed, 583 insertions, 0 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index f0267706cb4..5aa099bc769 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -2135,6 +2135,20 @@ config FB_MX3 far only synchronous displays are supported. If you plan to use an LCD display with your i.MX31 system, say Y here. +config FB_BROADSHEET + tristate "E-Ink Broadsheet/Epson S1D13521 controller support" + depends on FB + select FB_SYS_FILLRECT + select FB_SYS_COPYAREA + select FB_SYS_IMAGEBLIT + select FB_SYS_FOPS + select FB_DEFERRED_IO + help + This driver implements support for the E-Ink Broadsheet + controller. The release name for this device was Epson S1D13521 + and could also have been called by other names when coupled with + a bridge adapter. + source "drivers/video/omap/Kconfig" source "drivers/video/backlight/Kconfig" diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 2a998ca6181..edd5a85c1eb 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -106,6 +106,7 @@ obj-$(CONFIG_FB_PMAG_BA) += pmag-ba-fb.o obj-$(CONFIG_FB_PMAGB_B) += pmagb-b-fb.o obj-$(CONFIG_FB_MAXINE) += maxinefb.o obj-$(CONFIG_FB_METRONOME) += metronomefb.o +obj-$(CONFIG_FB_BROADSHEET) += broadsheetfb.o obj-$(CONFIG_FB_S1D13XXX) += s1d13xxxfb.o obj-$(CONFIG_FB_SH7760) += sh7760fb.o obj-$(CONFIG_FB_IMX) += imxfb.o diff --git a/drivers/video/broadsheetfb.c b/drivers/video/broadsheetfb.c new file mode 100644 index 00000000000..509cb92e873 --- /dev/null +++ b/drivers/video/broadsheetfb.c @@ -0,0 +1,568 @@ +/* + * broadsheetfb.c -- FB driver for E-Ink Broadsheet controller + * + * Copyright (C) 2008, Jaya Kumar + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + * + * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. + * + * This driver is written to be used with the Broadsheet display controller. + * + * It is intended to be architecture independent. A board specific driver + * must be used to perform all the physical IO interactions. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/list.h> +#include <linux/uaccess.h> + +#include <video/broadsheetfb.h> + +/* Display specific information */ +#define DPY_W 800 +#define DPY_H 600 + +static struct fb_fix_screeninfo broadsheetfb_fix __devinitdata = { + .id = "broadsheetfb", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_STATIC_PSEUDOCOLOR, + .xpanstep = 0, + .ypanstep = 0, + .ywrapstep = 0, + .line_length = DPY_W, + .accel = FB_ACCEL_NONE, +}; + +static struct fb_var_screeninfo broadsheetfb_var __devinitdata = { + .xres = DPY_W, + .yres = DPY_H, + .xres_virtual = DPY_W, + .yres_virtual = DPY_H, + .bits_per_pixel = 8, + .grayscale = 1, + .red = { 0, 4, 0 }, + .green = { 0, 4, 0 }, + .blue = { 0, 4, 0 }, + .transp = { 0, 0, 0 }, +}; + +/* main broadsheetfb functions */ +static void broadsheet_issue_data(struct broadsheetfb_par *par, u16 data) +{ + par->board->set_ctl(par, BS_WR, 0); + par->board->set_hdb(par, data); + par->board->set_ctl(par, BS_WR, 1); +} + +static void broadsheet_issue_cmd(struct broadsheetfb_par *par, u16 data) +{ + par->board->set_ctl(par, BS_DC, 0); + broadsheet_issue_data(par, data); +} + +static void broadsheet_send_command(struct broadsheetfb_par *par, u16 data) +{ + par->board->wait_for_rdy(par); + + par->board->set_ctl(par, BS_CS, 0); + broadsheet_issue_cmd(par, data); + par->board->set_ctl(par, BS_DC, 1); + par->board->set_ctl(par, BS_CS, 1); +} + +static void broadsheet_send_cmdargs(struct broadsheetfb_par *par, u16 cmd, + int argc, u16 *argv) +{ + int i; + + par->board->wait_for_rdy(par); + + par->board->set_ctl(par, BS_CS, 0); + broadsheet_issue_cmd(par, cmd); + par->board->set_ctl(par, BS_DC, 1); + + for (i = 0; i < argc; i++) + broadsheet_issue_data(par, argv[i]); + par->board->set_ctl(par, BS_CS, 1); +} + +static void broadsheet_burst_write(struct broadsheetfb_par *par, int size, + u16 *data) +{ + int i; + u16 tmp; + + par->board->set_ctl(par, BS_CS, 0); + par->board->set_ctl(par, BS_DC, 1); + + for (i = 0; i < size; i++) { + par->board->set_ctl(par, BS_WR, 0); + tmp = (data[i] & 0x0F) << 4; + tmp |= (data[i] & 0x0F00) << 4; + par->board->set_hdb(par, tmp); + par->board->set_ctl(par, BS_WR, 1); + } + + par->board->set_ctl(par, BS_CS, 1); +} + +static u16 broadsheet_get_data(struct broadsheetfb_par *par) +{ + u16 res; + /* wait for ready to go hi. (lo is busy) */ + par->board->wait_for_rdy(par); + + /* cs lo, dc lo for cmd, we lo for each data, db as usual */ + par->board->set_ctl(par, BS_DC, 1); + par->board->set_ctl(par, BS_CS, 0); + par->board->set_ctl(par, BS_WR, 0); + + res = par->board->get_hdb(par); + + /* strobe wr */ + par->board->set_ctl(par, BS_WR, 1); + par->board->set_ctl(par, BS_CS, 1); + + return res; +} + +static void broadsheet_write_reg(struct broadsheetfb_par *par, u16 reg, + u16 data) +{ + /* wait for ready to go hi. (lo is busy) */ + par->board->wait_for_rdy(par); + + /* cs lo, dc lo for cmd, we lo for each data, db as usual */ + par->board->set_ctl(par, BS_CS, 0); + + broadsheet_issue_cmd(par, BS_CMD_WR_REG); + + par->board->set_ctl(par, BS_DC, 1); + + broadsheet_issue_data(par, reg); + broadsheet_issue_data(par, data); + + par->board->set_ctl(par, BS_CS, 1); +} + +static u16 broadsheet_read_reg(struct broadsheetfb_par *par, u16 reg) +{ + broadsheet_send_command(par, reg); + msleep(100); + return broadsheet_get_data(par); +} + +static void __devinit broadsheet_init_display(struct broadsheetfb_par *par) +{ + u16 args[5]; + + args[0] = DPY_W; + args[1] = DPY_H; + args[2] = (100 | (1 << 8) | (1 << 9)); /* sdcfg */ + args[3] = 2; /* gdrv cfg */ + args[4] = (4 | (1 << 7)); /* lut index format */ + broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args); + + /* did the controller really set it? */ + broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args); + + args[0] = 4; /* fsync len */ + args[1] = (10 << 8) | 4; /* fend/fbegin len */ + args[2] = 10; /* line sync len */ + args[3] = (100 << 8) | 4; /* line end/begin len */ + args[4] = 6; /* pixel clock cfg */ + broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_TMG, 5, args); + + /* setup waveform */ + args[0] = 0x886; + args[1] = 0; + broadsheet_send_cmdargs(par, BS_CMD_RD_WFM_INFO, 2, args); + + broadsheet_send_command(par, BS_CMD_UPD_GDRV_CLR); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_write_reg(par, 0x330, 0x84); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + args[0] = (0x3 << 4); + broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args); + + args[0] = 0x154; + broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args); + + broadsheet_burst_write(par, DPY_W*DPY_H/2, + (u16 *) par->info->screen_base); + + broadsheet_send_command(par, BS_CMD_LD_IMG_END); + + args[0] = 0x4300; + broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND); + + par->board->wait_for_rdy(par); +} + +static void __devinit broadsheet_init(struct broadsheetfb_par *par) +{ + broadsheet_send_command(par, BS_CMD_INIT_SYS_RUN); + /* the controller needs a second */ + msleep(1000); + broadsheet_init_display(par); +} + +static void broadsheetfb_dpy_update_pages(struct broadsheetfb_par *par, + u16 y1, u16 y2) +{ + u16 args[5]; + unsigned char *buf = (unsigned char *)par->info->screen_base; + + /* y1 must be a multiple of 4 so drop the lower bits */ + y1 &= 0xFFFC; + /* y2 must be a multiple of 4 , but - 1 so up the lower bits */ + y2 |= 0x0003; + + args[0] = 0x3 << 4; + args[1] = 0; + args[2] = y1; + args[3] = cpu_to_le16(par->info->var.xres); + args[4] = y2; + broadsheet_send_cmdargs(par, BS_CMD_LD_IMG_AREA, 5, args); + + args[0] = 0x154; + broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args); + + buf += y1 * par->info->var.xres; + broadsheet_burst_write(par, ((1 + y2 - y1) * par->info->var.xres)/2, + (u16 *) buf); + + broadsheet_send_command(par, BS_CMD_LD_IMG_END); + + args[0] = 0x4300; + broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND); + + par->board->wait_for_rdy(par); + +} + +static void broadsheetfb_dpy_update(struct broadsheetfb_par *par) +{ + u16 args[5]; + + args[0] = 0x3 << 4; + broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args); + + args[0] = 0x154; + broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args); + broadsheet_burst_write(par, DPY_W*DPY_H/2, + (u16 *) par->info->screen_base); + + broadsheet_send_command(par, BS_CMD_LD_IMG_END); + + args[0] = 0x4300; + broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND); + + par->board->wait_for_rdy(par); + +} + +/* this is called back from the deferred io workqueue */ +static void broadsheetfb_dpy_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ + u16 y1 = 0, h = 0; + int prev_index = -1; + struct page *cur; + struct fb_deferred_io *fbdefio = info->fbdefio; + int h_inc; + u16 yres = info->var.yres; + u16 xres = info->var.xres; + + /* height increment is fixed per page */ + h_inc = DIV_ROUND_UP(PAGE_SIZE , xres); + + /* walk the written page list and swizzle the data */ + list_for_each_entry(cur, &fbdefio->pagelist, lru) { + if (prev_index < 0) { + /* just starting so assign first page */ + y1 = (cur->index << PAGE_SHIFT) / xres; + h = h_inc; + } else if ((prev_index + 1) == cur->index) { + /* this page is consecutive so increase our height */ + h += h_inc; + } else { + /* page not consecutive, issue previous update first */ + broadsheetfb_dpy_update_pages(info->par, y1, y1 + h); + /* start over with our non consecutive page */ + y1 = (cur->index << PAGE_SHIFT) / xres; + h = h_inc; + } + prev_index = cur->index; + } + + /* if we still have any pages to update we do so now */ + if (h >= yres) { + /* its a full screen update, just do it */ + broadsheetfb_dpy_update(info->par); + } else { + broadsheetfb_dpy_update_pages(info->par, y1, + min((u16) (y1 + h), yres)); + } +} + +static void broadsheetfb_fillrect(struct fb_info *info, + const struct fb_fillrect *rect) +{ + struct broadsheetfb_par *par = info->par; + + sys_fillrect(info, rect); + + broadsheetfb_dpy_update(par); +} + +static void broadsheetfb_copyarea(struct fb_info *info, + const struct fb_copyarea *area) +{ + struct broadsheetfb_par *par = info->par; + + sys_copyarea(info, area); + + broadsheetfb_dpy_update(par); +} + +static void broadsheetfb_imageblit(struct fb_info *info, + const struct fb_image *image) +{ + struct broadsheetfb_par *par = info->par; + + sys_imageblit(info, image); + + broadsheetfb_dpy_update(par); +} + +/* + * this is the slow path from userspace. they can seek and write to + * the fb. it's inefficient to do anything less than a full screen draw + */ +static ssize_t broadsheetfb_write(struct fb_info *info, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct broadsheetfb_par *par = info->par; + unsigned long p = *ppos; + void *dst; + int err = 0; + unsigned long total_size; + + if (info->state != FBINFO_STATE_RUNNING) + return -EPERM; + + total_size = info->fix.smem_len; + + if (p > total_size) + return -EFBIG; + + if (count > total_size) { + err = -EFBIG; + count = total_size; + } + + if (count + p > total_size) { + if (!err) + err = -ENOSPC; + + count = total_size - p; + } + + dst = (void *)(info->screen_base + p); + + if (copy_from_user(dst, buf, count)) + err = -EFAULT; + + if (!err) + *ppos += count; + + broadsheetfb_dpy_update(par); + + return (err) ? err : count; +} + +static struct fb_ops broadsheetfb_ops = { + .owner = THIS_MODULE, + .fb_read = fb_sys_read, + .fb_write = broadsheetfb_write, + .fb_fillrect = broadsheetfb_fillrect, + .fb_copyarea = broadsheetfb_copyarea, + .fb_imageblit = broadsheetfb_imageblit, +}; + +static struct fb_deferred_io broadsheetfb_defio = { + .delay = HZ/4, + .deferred_io = broadsheetfb_dpy_deferred_io, +}; + +static int __devinit broadsheetfb_probe(struct platform_device *dev) +{ + struct fb_info *info; + struct broadsheet_board *board; + int retval = -ENOMEM; + int videomemorysize; + unsigned char *videomemory; + struct broadsheetfb_par *par; + int i; + + /* pick up board specific routines */ + board = dev->dev.platform_data; + if (!board) + return -EINVAL; + + /* try to count device specific driver, if can't, platform recalls */ + if (!try_module_get(board->owner)) + return -ENODEV; + + info = framebuffer_alloc(sizeof(struct broadsheetfb_par), &dev->dev); + if (!info) + goto err; + + videomemorysize = (DPY_W*DPY_H); + videomemory = vmalloc(videomemorysize); + if (!videomemory) + goto err_fb_rel; + + memset(videomemory, 0, videomemorysize); + + info->screen_base = (char *)videomemory; + info->fbops = &broadsheetfb_ops; + + info->var = broadsheetfb_var; + info->fix = broadsheetfb_fix; + info->fix.smem_len = videomemorysize; + par = info->par; + par->info = info; + par->board = board; + par->write_reg = broadsheet_write_reg; + par->read_reg = broadsheet_read_reg; + init_waitqueue_head(&par->waitq); + + info->flags = FBINFO_FLAG_DEFAULT; + + info->fbdefio = &broadsheetfb_defio; + fb_deferred_io_init(info); + + retval = fb_alloc_cmap(&info->cmap, 16, 0); + if (retval < 0) { + dev_err(&dev->dev, "Failed to allocate colormap\n"); + goto err_vfree; + } + + /* set cmap */ + for (i = 0; i < 16; i++) + info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/32; + memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*16); + memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*16); + + retval = par->board->setup_irq(info); + if (retval < 0) + goto err_cmap; + + /* this inits the dpy */ + retval = board->init(par); + if (retval < 0) + goto err_free_irq; + + broadsheet_init(par); + + retval = register_framebuffer(info); + if (retval < 0) + goto err_free_irq; + platform_set_drvdata(dev, info); + + printk(KERN_INFO + "fb%d: Broadsheet frame buffer, using %dK of video memory\n", + info->node, videomemorysize >> 10); + + + return 0; + +err_free_irq: + board->cleanup(par); +err_cmap: + fb_dealloc_cmap(&info->cmap); +err_vfree: + vfree(videomemory); +err_fb_rel: + framebuffer_release(info); +err: + module_put(board->owner); + return retval; + +} + +static int __devexit broadsheetfb_remove(struct platform_device *dev) +{ + struct fb_info *info = platform_get_drvdata(dev); + + if (info) { + struct broadsheetfb_par *par = info->par; + unregister_framebuffer(info); + fb_deferred_io_cleanup(info); + par->board->cleanup(par); + fb_dealloc_cmap(&info->cmap); + vfree((void *)info->screen_base); + module_put(par->board->owner); + framebuffer_release(info); + } + return 0; +} + +static struct platform_driver broadsheetfb_driver = { + .probe = broadsheetfb_probe, + .remove = broadsheetfb_remove, + .driver = { + .owner = THIS_MODULE, + .name = "broadsheetfb", + }, +}; + +static int __init broadsheetfb_init(void) +{ + return platform_driver_register(&broadsheetfb_driver); +} + +static void __exit broadsheetfb_exit(void) +{ + platform_driver_unregister(&broadsheetfb_driver); +} + +module_init(broadsheetfb_init); +module_exit(broadsheetfb_exit); + +MODULE_DESCRIPTION("fbdev driver for Broadsheet controller"); +MODULE_AUTHOR("Jaya Kumar"); +MODULE_LICENSE("GPL"); |